Answer:
0 °C
Explanation:
The melting point of a substance is the temperature at which it changes state from solid to liquid.
<span>H2SO3 I DONT REALLY KNOW HOW TO EXPLAIN IT BUT HERE IS THE ANSWER
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Answer:81.6%
Explanation:
Mass of CaCO3=4.010 g
Molar mass of CaCO3= 40+12+(16×3) = 100 g/mol.
Recall: number of moles(n)= mass÷ molar mass.
n=4.010÷100 = 0.0401 mol.
Molar mass of CaCl2 = 40+71= 111 g/mol.
Number of mol of CaCl2 = 5.455÷111= 0.04914 g/mol.
Mass of CaCl2 = 0.0401 × 111 = 4.4511 g of CaCl2.
Percent by mass of CaCl2 = (4.4511÷5.455) × 100
= 0.815967 ×100 = 81.5967%
Approximately; 81.6%.
Answer:
7.99 moles of boron
Explanation:
Given data:
Number of moles of B = ?
Number of atoms of B = 4.81 × 10²⁴ atom
Solution:
Avogadro number:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance. The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ atoms
4.81 × 10²⁴ atom × 1 mol / 6.022 × 10²³ atoms
0.799 × 10¹ mol
7.99 moles